Despite Apple fighting to protect customer data in recent years, the company is reportedly storing the call history of iPhone users, uploading the records to the iCloud for as long as four months – unbeknownst to its loyal customers.

According to Russian digital forensics firm Elcomsoft, Apple's iPhone and other iOS devices automatically send customers' call histories to iCloud if the synching service is turned on. That data is apparently uploaded without the user knowing or receiving notification.

“You only need to have iCloud itself enabled” for the data to be sent, Elcomsoft CEO Vladimir Katalov toldthe Intercept.